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Linux/IWR1642: /mmWaveDataHdl/RScan/header/stamp;the stamp is always zero

Part Number: IWR1642

Tool/software: Linux

From the topic /mmWaveDataHdl/RScan record PCD file, the timestamp is always zero, why, how can I name the PCD file with the correct timestamp?

The time stamp printed by the terminal looks like this:

rostopic echo /mmWaveDataHdl/RScan/header/stamp

secs: 0
nsecs:         0
---

secs: 0
nsecs:         0
---

secs: 0
nsecs:         0
---

secs: 0
nsecs:         0
---

secs: 0
nsecs:         0
---